table{
	width:90%;
	height:auto;
	margin:10px auto;
	border:blue;
}
th,td{height:30px; line-height:30px;}
.btn{width:50px; height:30px; text-align:center;}
.input_num{width:40px; height:30px; text-align:center;}
td{text-align:center;}
.td_total_price{text-align:right;}